Established by Fifth Air Force in Australia in May 1943 specifically to accommodate very long range Lockheed P-38J Lightnings at Amberley Airfield in Queensland, Australia. The 431st was specifically trained to provide long-range escort for bombers during daylight raids on Japanese airfields and strongholds in the Netherlands East Indies and the Bismarck Archipelago. On 14 August 1943, the 431st transferred from Amberley airfield to Port Moresby. New Guinea. The squadron was inactivated on 1 April 1949 at Ashiya Airfield, Japan.